Capitalization when sentence begins with chemical name

Question

It is generally considered poor form to begin a sentence with a numeric digit. For example,

4% of people are old.

should be

Four percent of people are old.

What is the rule when you need to begin a sentence with a chemical name that should not be converted to a word?

2-chloroprocaine is an anesthetic.

It doesn't seem right to capitalize the first letter after the number, because chemicals are not normally capitalized.

2-Chloroprocaine is an anesthetic.

Spelling it out seems inaccurate.

Two-chloroprocaine is an anesthetic.

Rewriting the sentence makes it confusing.

An anesthetic, 2-chloroprocaine, is.

Answer 1

An article called Effects of Concentration and Volume of 2-Chloroprocaine on Epidural Anesthesia in Volunteers has a sentence beginning with the chemical, which is capitalized:

2-Chloroprocaine has different physicochemical properties (higher pKa and lower lipid solubility) than other commonly used local anesthetics.

Otherwise, it remains lowercase:

This study was performed to delineate effects of a threefold difference in concentration and volume of 2-chloroprocaine on sensory and motor block during epidural anesthesia in a crossover fashion.